If you use their subscribe & save program on diapers, you can get Pampers or Huggies for just $0.15/diaper! Walmart's standard price on Pampers is $0.25/diaper. I just bought 176 Pampers diapers for $27.24.
We have really benefited from using Amazon Mom, so I thought I would pass along that information. I'm not being paid by Amazon to advertise for them. :)
You can get more information here.